Water-gage for steam-boilers.



D. DAHLSTBDT. WATER GAGE FOR STEAM BOILERS. APPQIOATION FILED SEPLM, 1906.

933,236., Patented Se t. 7, 1909.

II/111m as I witnesses:

. 75 v fid atmrnep DAVIDDA-I-ILSTEDT', on KANSAS" CITY, MISSOURI.

WATER-GAGE non s'rEArcBoILEns.

Specification of Iietters- Patent.

Patented Sept. 7., 1909.

Application filed- September 24,1906. Serial No. 335,950.

To alt whom ttmayiconciern:

Be it known that I, DAVJI) DAHLSTEDT, citizen of the United States, residing-fat Kansas City, in thecountyofJackson' and State of Missouri, have invented certain new and useful Improvements in Vvater- Gages for Steam-Boilers, of which the following is a specification.

My invention relates to improvements in water gages for steam boilers.

The object of my invention is to provide valve mechanism by Which, when the translucent tube of the'water gage of a steam boiler is removed-or broken, the conductors connecting the boiler with the ends ofthe tube will be automatically closed by valves provided: for the purpose, manua-lly operated means being. provided by which, when the translucent tube is replaced, one of the valves may be moved to the open position, thuspermitting the flow of fluid from the boiler through the conductors into the transs lucent tube.=

the accompanying drawings which illustrate my invention, Figure 1 is'a central vertical sectional View of the valve mechanism-connectedwith one of the conductors' which connectthe boiler with the translucent tube, a portionof the boiler and a partof one of said conductors being shown. In this view, the automatic valve is shown in solid lines in the closed position, and; in dotted lines inthe open position. The manually operated rod'is shown in solid lines in the elevated position, and in dotted lines in the depressed position. Fig. 2 is a. vertical cross section taken on thedotted line a---b"ofFig. 1. Fig. 3 is a side elevation view of what ;is; shown in Fig. 1, the portion of the boiler being omitted. Fig. 4 is a view-tpartly invertical section and partly in side elevation of a part of a boiler, the translucent tube and the conductors connecting the tube with the boiler.

Similar characters of reference denote similar parts.

1 denotes an ordinary steam boiler plate, 2 the ordinary vertical translucent glass observation tube, by which the height of water in the boiler is noted. Gonnected'to the respective ends of the tube 2 and to the boiler are two conductors formed in any desirable manner and provided each with a valve, which, when the tube 2 is broken or removed, will be automatically closed by the pressure of the fluid in the boiler, thus preventing the escape of steam or water through the conductor until the valve 2 is replaced. Each valve is normally held 'in the open position, and means are provided by which after the tube 2 has been replaced one of the valves may be forced to the open position so as-to permit the fluid from the boiler entering" the two conductors and tube 2.

In the drawings I have illustrated the preferred form of valve mechanism to be employed in connection with the two conductors. In this'preferred'form, each conductor comprises a valve'casing 3, a coupling 4 connected to the boiler at one end and at the other end connected withone end of the valve casing, the other endof the valve casing: 3' being connected by a tube 5 with one end of an elbow 6, the other end of which communicates with-the adjacent end of the tube 2. Encircling the tube 2 are the usual packing boxes 7 which are secured respectively to the two elbows 6 by screw threaded connection, packing material 8 being interposed between the packing'boxes and the'elbows and encircling. the tube 2.

I will now refer particularly to Figs. 1, 2 and 3 in describing the valve mechanism connected witheach valve casing 3. Each valve casing 3 is divided by a partition 9 into two chambers 11 and 12 which communicate-respectively with the adjacent coupling 4 and tube 5 respectively. A valve opening 13 connects the two chambers 11 and 12 of each valvet' In each valve casing, preferably in the chamber 11 ismounted a valve 14: which normally-is held in the open position-by gravity or by any other suitable means, andiwhich, when the tube 2 is removedtorbrokenwill bemoved by fluid pressure in the boiler operating through the adjacent coupling 4 and chamber 11 to a position in which the opening 13 will be closed, as shown in Figs. 1 and 2. The preferable form of Valve employed is a valve having an arm 15 pivoted to a horizontal screw 16 mounted at its ends in the wall of the valve casing 3, the valve being located in chamber 11 so as to swing vertically to and from thenoted also that the screw 16 is disposed in chamber 11 intermediate the inlet and outlet to said chamber, and in a position which will cause the valve 14 to drop from its seat by gravity when the pressure on both sides of the valve is alike. Each valve casing 3 is provided above the opening 13 with a vertical screw threaded hole in which is fitted a threaded rotatable rod 17, the lower end of whichextends into the chamber 12, the upper end extending outside the casing and having secured thereto a hand wheel 18 by which the rod is turned so as to be moved longitudinally. The normal position of each rod 17 is as shown in Fig. 1, out of contact with the valve 14.

7 If the tube 2 is broken or removed, the

' pressure of the fluid in the boiler will swing both valves 14 to the closed position shown in solid lines in Figs. 1 and 2. Escape of fluid from .the chambers 11 through openings 13 will thus be prevented. After the tube 2 has been replaced, the valves 14 will still remain closed, being so held by pressure on their inner or lower sides. If now either of the rods 17 is rotated in the proper direction, by means of its hand wheel 18, the rod which is so rotated will be forced down- 1 soon have a pressure equaling the pressure in the adjacent chamber 11 in said conductor, at which time the valve 14 in said opposite conductor will fall bygravity and a circuit will thus again be established be- I" tween the boiler 1, tube 2 and the two con- 'ductors of which the casings 3 form parts.

The rod 17 which has thus been depressed will then be rotated in the opposite direction so as to elevate it to the position shown in solid lines in Fig. 1, in which position it will clear the adjacent valve. Each rod 17 is preferably encircled by a packing box 19 having a screw threaded lower end fitted to the cylindrical screw threaded boss 20 provided on the upper side of each valve casing 3 and through which the adjacent rod 17 extends. Packing material 21 is provided in the usual manner in the boxes 19 and encircling the rods 17. Each casing 3 may be provided with an opening 22 communicating with the lower side of the chamber 11 and in which is fitted a draw off cock 23. By-connecting the draw ofl' cook 23 to chamber 11 instead of to chamber 12, the approximate height of the water in the boiler may be determined even when the glass observation tube is broken. For this reason the cook 23 should be connected with the casing 3 on the boiler side of the valve 14. If desired, one of the cooks 23 may be dispensed with, and one of the rods 17 may also be dispensed with. In such cases, of course, the casing not provided with the cook 23 or rod 17 would not be provided with the openings in which such parts are mounted.

My invention may be varied within the scope of the appended claim without departing from its spirit.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is

The combination with a valve casing forming a chamber having an outlet opening and an inlet opening adapted to be connected with a boiler, of a valve located in said chamber and having an arm, a screw extending through the wall of said easing into said chamber, said valve arm being pivoted to said screw, the screw being disposed in a position such that the valve can be swung by pressure from the boiler to close said outlet opening the valve being movable by its weight from the position closing said outlet opening, and a draw oif cock connected with said chamber intermediate said inlet and outlet openings.

In testimony whereof I aflix my signature in presence of two witnesses.

DAVID DAHLSTEDT.

Witnesses E. B. HoUsE, Gno. LA MOUNTAIN. 

